SCERT Maharashtra Question Bank solutions for 10th Standard SSC Science and Technology 1 Maharashtra State Board 2021 chapter 3 - Chemical reactions and equations [Latest edition]

Writing a chemical reaction in brief by using chemical formulae is called as _______.

When the positive charge on an ion increases or the negative charge on them decreases it is called as _______.

The chemical reaction in which two or more products are formed from a single reactant is called _______ reaction.

In the chemical equation the _______ are written on the left-hand side.

Choose the correct option from the bracket and explain the statement giving a reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition) 

Addition of an aqueous solution of ZnSO₄ to an aqueous solution of BaCl₂ is an example of ______ reaction.

Write chemical formula for rust.

Complete the given chemical reaction.

\[\ce{CuSO_{4(aq)} + Fe_{(s)} ->}\]______ + ______

If edible oil is left aside for a long time, it will get rancid.

Write an Explanation.

Balanced equations

Write an Explanation.

Endothermic reaction

Write scientific reason.

Always paint grills of doors and windows before using them.

Give scientific reason.

It is reccommended to use air tight container for storing oil for long time.

Give scientific reason.

When the gas formed on heating limstone is passed through freshly prepared lime water, the lime water turns milky.

Give scientific reason.

It takes time for pieces of Shahabad tile to disappear in HCl, but its powder disappears rapidly.

Write scientific reason.

Adding zinc particles to a solution of copper sulphate makes the blue solution colorless.

Explain the factors affecting the rate of chemical reaction with example.

What are reactants? Explain with the help of example.

What are products? Explain with the help of example.

Explain the following reaction with their balanced chemical equation.

Ammonia gas reacts with hydrogen chloride. 

Explain the following reaction with their balanced chemical equation.

Hydrogen sulphide reacts with sulphur dioxide.

Classify the following reaction into Exothermic and Endothermic reactions.

Magnesium ribbon when burned in air, it forms magnesium oxide.

Identify the endothermic and exothermic reaction.

 HCl + NaOH → NaCl + H₂O + heat 

Identify the endothermic and exothermic reaction.

\[\ce{2KClO_{3(s)}->[\Delta] 2KCl_{(s)} + 3O2}\]

Identify the endothermic and exothermic reaction.

\[\ce{CaO + H2O -> Ca(OH)2 + Heat}\]

Identify the endothermic and exothermic reaction.

\[\ce{CaCO_{3(s)}->[\Delta] CaO_{(s)} + CO2}\]

Explain the following reaction with the balanced equation.

Aluminium reacts with dil hydrochloric acid

Explain the following reaction with the balanced equation.

Reaction of zinc with dil hydrochloric acid

Match the columns.

Write three steps of writing chemical equations with example?

Identify from the following reaction the reactants that undergo oxidation and reduction.

2Ag₂O → 4 Ag + O₂ ↑

Identify from the reaction the reactants that undergo oxidation and reduction.

2Mg + O₂ → 2MgO

Identify from the reaction the reactants that undergo oxidation and reduction.

\[\ce{NiO + H2 -> Ni + H2O}\]

What is corrosion?

What is electrolysis?

Which changes occur during chemical changes?

What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.

Explain the reaction given in the figure.

Balance the given chemical reaction as per the instructions below.

\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]

Write names of reactants and products of chemical reaction.

Balance the given chemical reaction as per the instructions below.

\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]

Make a list of the elements in the chemical equation.

Balance the given chemical reaction as per the instructions below.

\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]

Write the number of atoms of various elements in the reactants and products.

Balance the given chemical reaction as per the instructions below.

\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]

Balance the equation with proper coefficient and rewrite the equation.

Balance the given chemical reaction as per the instructions below.

\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]

Oxidation means losing electrons then what is reduction?

Observe the following figure and write the answer of the question.

1. Which process is shown in the figure?
2. Explain the chemical reaction shown in the figure.
3. Write the reactions on anode and cathode.